/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright 2010 huliqing, huliqing.cn@gmail.com
 *
 * This file is part of QFaces.
 * QFaces is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * QFaces is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with QFaces.  If not, see <http://www.gnu.org/licenses/>.
 *
 * 这个文件是QFaces的一部分。
 * 您可以单独使用或分发这个文件，但请不要移除这个头部声明信息.
 * QFaces是一个自由软件，您可以自由分发、修改其中的源代码或者重新发布它，
 * 新的任何修改后的重新发布版必须同样在遵守LGPL3或更后续的版本协议下发布.
 * 关于LGPL协议的细则请参考COPYING、COPYING.LESSER文件，
 * 您可以在QFaces的相关目录中获得LGPL协议的副本，
 * 如果没有找到，请连接到 http://www.gnu.org/licenses/ 查看并获取副本。
 *
 * - Author: Huliqing
 * - Contact: huliqing.cn@gmail.com
 * - License: GNU Lesser General Public License (LGPL)
 * - Blog and source code availability: http://www.huliqing.name/
 */

package name.huliqing.qfaces;

import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.faces.FacesException;
import javax.faces.FactoryFinder;
import javax.faces.context.FacesContext;
import javax.faces.context.FacesContextFactory;
import javax.faces.lifecycle.Lifecycle;
import javax.servlet.Servlet;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import name.huliqing.qfaces.lifecycle.AjaxLifecycle;

/**
 *
 * @author huliqing
 */
public class FacesServlet implements Servlet {

    private Logger logger = java.util.logging.Logger.getLogger(FacesServlet.class.getName());
    private FacesContextFactory facesContextFactory = null;
    private Lifecycle lifecycle = null;
    private ServletConfig servletConfig = null;

    public void destroy() {
        facesContextFactory = null;
        lifecycle = null;
        servletConfig = null;
    }

    public ServletConfig getServletConfig() {
        return (this.servletConfig);
    }

    public String getServletInfo() {
        return (this.getClass().getName());
    }

    public void init(ServletConfig servletConfig) throws ServletException {

//        long start = System.currentTimeMillis();

        // Save our ServletConfig instance
        this.servletConfig = servletConfig;

        // Acquire our FacesContextFactory instance
        try {
            facesContextFactory = (FacesContextFactory) FactoryFinder.getFactory(FactoryFinder.FACES_CONTEXT_FACTORY);
        } catch (FacesException e) {
            logger.log(Level.SEVERE, null, e);
        }

        // Ajax lifecycle
        try {
            lifecycle = new AjaxLifecycle();
        } catch (FacesException e) {
            Throwable rootCause = e.getCause();
            if (rootCause == null) {
                throw e;
            } else {
                throw new ServletException(e.getMessage(), rootCause);
            }
        }

//        logger.fine("QFacesServlet Init User Time:" + (System.currentTimeMillis() - start));
    }

    public void service(ServletRequest request,
            ServletResponse response)
            throws IOException, ServletException {
        String pathInfo = ((HttpServletRequest) request).getPathInfo();
        if (pathInfo != null) {
            pathInfo = pathInfo.toUpperCase();
            if (pathInfo.startsWith("/WEB-INF/")
                    || pathInfo.equals("/WEB-INF")
                    || pathInfo.startsWith("/META-INF/")
                    || pathInfo.equals("/META-INF")) {
                ((HttpServletResponse) response).sendError(HttpServletResponse.SC_NOT_FOUND);
                return;
            }
        }

        // Acquire the FacesContext instance for this request
        FacesContext context = facesContextFactory.getFacesContext(servletConfig.getServletContext(), request, response, lifecycle);

        // Execute the request processing lifecycle for this request
        try {
            lifecycle.execute(context);
            lifecycle.render(context);
        } catch (FacesException e) {
            Throwable t = e.getCause();
            if (t == null) {
                throw new ServletException(e.getMessage(), e);
            } else {
                if (t instanceof ServletException) {
                    throw ((ServletException) t);
                } else if (t instanceof IOException) {
                    throw ((IOException) t);
                } else {
                    throw new ServletException(t.getMessage(), t);
                }
            }
        } finally {
            // Release the FacesContext instance for this request
            context.release();
        }
    }
}
